Hypodermic power-syringe.



v No. 781,283.

PATENTEDJAN. 31, 1905. P. A. HIGGINS. HYPODBRMIG POWER SYRINGB.

`APPLIGATION FILED JUNE 27, 1904.

- lUNITED STATES Patented January 31, 1905,

PATENT OFFICE.

FRANK A. HIGGINS, OF BELLEVUE, OHIO.

HYPODERMIC POWERSYRINGE.\

SPECIFICATION forming part of Letters Patent No. 781,283, dated January 31, 1905.

Application led June 27, 1.904.. Serial No. 214,275.

To a/ZZ whom t may concern: A Be it known that I, FRANK A.IIIGGINs, a citizen of the United States, residing at Bellevue, Huron county, Ohio, yhave invented certain new and useful Improvements in Hypodermic Power-Syringes, of which the following is a specification that will enable those skilled in the art to which my invention pertains to make and use the same, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to syringes particu.-

larly adapted to forcibly injecting liuid reme dies, anesthetics, &c., into the dentine, bones,

or other highly-resistant parts of a patient.

Its principal objects are to produce a syringe in which very great pressure may be generated on the liquid charge therein; to provide a screw-feed for the piston that will advance it with great power and will hold it at any point against reaction; to provide an expanv sible piston-packing that may be adjusted to fit the barrel as tightly as desired; to provide a handle that may be grasped with equal facility either endwise or sidewise between the palm and lingers ofthe operator; to provide a strong spring-cushion between the handle and the piston-moving mechanism, so that a i fairly-constant and even pressure may be maintained on strument of this characterfthat will be neat, simple, compact, handy, easily operated, and kept clean and that may be cheaply constructed and placed upon themarket at a reasonable price.

My invention consists of such features and combinations of features adapted to effect its objects, as will hereinafter be fully described and claimed The accompanying drawmgs show my 1nvention 1n general form and construction of details now deemed most desirable by me; Vbutv .eral outline,

thel point of the instrumentV vwhen it is being used, and to produce an ina power-syringe embodying my invention.V

similar sections on the lines 3 3 and 4 4, re-

spectively, of Fig. 1.

Thehandle A of my syringe is a frame of preferably cast metal about square in its genwith its sides a and back end a Vincurved from corner to corner, as shown, and incurved, as at a2, at each side of the center on its front end. This makes a very light and strong handle-of a` shape particularly favorable to be strongly grasped in either direction. The front bar is swelled at its center andhas a perforation a3, through which the rear screw-th readed end of the barrel B passes. A checknut on the barrel presses against the front face of the bar a2, while a hollow nut Z1 is screwed onto the rear end of the barrel, partly closing it and acting with the nut to securely lock the barrel to the handle. The front end of the barrel is provided with the usual nipple C, and supplementary nipple or hollow needle point D, the lirst being screwed 'into the barrel. and the needle-point screwed onto the nipple, as shown. The nipple is conically bored or countersunk at its inner end c to the full diameter of the barrel, so that there are no hollow spaces, corners, or projecting ledges in or behind which air might lodge or impurities accumulate.

The needle-point is preferably square-ended, as shown-that is, it is not ground or cut at an angle, as is done Where the point is to have a cutting or penetrating edge. The piston is mounted on the front end of a central rod E, having a head e, behind which is a block f, of rubber or other suitable elastic material, seated in a cup or hydraulicwasher, of leather-.or other suitable material, which is fitted to the bore of the barrel. Back of this cup is loose metal washer f2, having a peripheral groove to carry lubricant, and back of this, again, is another cup or hydraulic i washer f3, pointing in the opposite direction from the cup f', and inclosing a block of rubber ff, against which lies a loose metal washer f5. Behind this washerand surrounding thev rod E is a hollow piston rod or sleeve Gr, which extends beyond the rear end of the barrel and Aroo its lock-nut b and is screw-threaded for a greater portion of its length, as shown. Upon the projecting extremity oi' this piston-sleeve is screwed a tubular sleeve-nut H. upon which is a thumb nut or wheel It, milled on its outer face, as shown at L. The rear end of this tubular nut extends into a hollow socket a, formed on the rear bar a of the handle, and between the end ofthe nut and the bottom of the socket is a strong spiral spring I, adapted to resist any backward movement of the piston and its actuating mechanism. The end of the rod E extends beyond the end of the piston-sleeve G and is screw-threaded for the reception of a hollow nut c. which bears against the end of the piston-sleeve. When this nut is turned, it draws the head e of the rod toward the front end of the piston-sleeve, contracting the space between them and compressing the rubber blocks, which expand laterally and force the cups f and f3 into closer contact with the walls of the barrel. The leather cups might be dispensed with but for the fact that the rubber blocks if brought directly into contact with the walls of the barrel would have an adhesion lthat would prevent their slipping as freely as does the leather under the same pressure. In order to prevent the piston-sleeve from turning with the sleevenut H, I form a groove g along one side, somewhat deeper than the screw-threads, and into this groove I project the point or end of a screw g' in the lock-nut b. This prevents the turning of the piston-sleeve, while allowing it to move longitudinally.

In order to prevent the rod E from turning with its nut e when the rubber piston-blocks are being expanded, I secure a cross-pin e2 in the rod and let its projecting ends lie in slots g2 in the piston-sleeve, these slots being long enough to allow of all necessary endwise movement ot' the rod. rIhe aperture a5 in the rear bar of the handle admits the passage of a screw-driver to adjust the nut e' in the pistonrod.

Having thus described my invention, what I claim as new and useful, and desire to secure by Letters Patent, is-

l. In a syringe, the combination of the syringe-barrel, an open frame secured to the barrel, a piston having a screw-threaded pistonrod which projects from the end ofthe barrel and a nut screwed on said piston-rod the outward thrust of which is resisted by the outer bar of the frame; substantially as described.

2. In a syringe, the combination of the syringe-barrel, an open frame secured to the barrel, a piston having a screw-threaded pistonrod which projects from the end of the barrel and a nut screwed onto said piston-rod, with a spring interposed between the back end of the nut and the rear bar of the frame; substantially as described.

3. In a syringe, the combination of the syringe-barrel, an open frame secured to the end of the barrel and having a socket formed on its rear bar in axial line with the barrel` a piston having a screw-threaded piston-rod which projects from the end of the barrel. a tubular nut screwed onto the piston-rod and bearing at its front end against a iixed portion of the frame while its rear end extends into the frame-socket, with a spring in the socket interposed between the end of the nut and the bottom of the socket; substantially as described.

4. In a syringe, the combination oi` the syringe-barrel, an open frame-handle secured to the rear end of the barrel and having its opposing sides incurved as shown, with a piston having a screw-threaded piston-rod which projects beyond the end of the barrel and a screwnut on said piston-rod having its end bearings between the front and rear bars of the handleframe; substantially as described.

5. A substantially square open frame-handle for a syringe having its sides incurved; substantially as described.

6. An open frame-handle for a syringe having its side and rear bars incurved as shown while its front bar is apertured at its middle for the reception of a syringe-barrel and incurved at each side of said aperture; substantially as described.

7. In a syringe, the combination of the syringe-barrel, a piston provided with expansible washers and having a hollow piston-rod projecting beyond the end of the barrel and screw-threaded on its exterior, a screw-nut on the hollow piston-rod to move it endwise, and a groove in the rod engaged by a fixed pin to keep it from turning, a central piston-tightening rod passing through the hollow piston-rod with a nut on its end bearing on the hollow piston-rod, and a cross-pin in the central rod extending into slots in the hollow piston-rod; substantially as described.

8. In a syringe, the combination oi: the syringe-barrel, a piston provided with expansible washers and having a hollow piston-rod projecting beyond the end oi thc barrel and screwthreaded on its exterior, a screw-nut on the hollow piston-rod, a groove in the rod engaged by a Xed pin, a central piston-tightening rod in thehollow piston-rod with a nuton its end bearing on the end of the hollow piston-rod, and means for preventing said tightening-rod from turning in thc hollow pistonrod; substantially as set forth.

In testimony whereof I have signed my n an 1e to this specification in the presence oi two subscribing witnesses.

FRANK A. HIGGINS. Vitnesses:

C. A. WILT, W. HERBERT GRulaNsLADu. 

